Samsung SGH-A707 AB653443CAB Replacement Battery 3.7V 800mAh

Samsung SGH-A707 / SGH-Z560 — 3.7V Li-ion Replacement Battery (AB653443CAB)

This is a 3.7V, 800mAh Li-ion replacement battery for the Samsung SGH-A707, SGH-A727, SGH-A171, and SGH-Z560, among others. It matches OEM part numbers AB653443CAB, AB603443CA, AB603443AA, and related variants. Install it directly in place of the original cell — no modification needed.

• SGH-A707 / SGH-Z560 platform fit: These models share the same 3.7V single-cell Li-ion architecture, connector pinout, and BMS handshake protocol. One cell covers the full range listed under AB653443CAB and its cross-reference part numbers.
• Bench tested on actual hardware: We cycled this cell through charge and full discharge on the SGH-A707 platform. The BMS accepted the cell without fault codes, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected at the low-voltage cutoff.
• Fuel gauge recalibration on first use: On first installation, run one complete discharge down to automatic shutoff, then charge uninterrupted to 100% without fast charging enabled. This gives the fuel gauge IC a clean reference curve against the new cell before normal use resumes.

Sudden shutdown at 20–30% on the SGH-A707 after cell replacement

The SGH-A707's fuel gauge IC holds a discharge curve calibrated to the original aged cell. A new cell has a steeper voltage cliff under modem and screen load, so the IC misjudges remaining capacity. When the phone fires the transmitter, instantaneous current draw pulls cell voltage below the BMS cutoff threshold before the displayed percentage reaches zero. The fix is one full discharge-to-shutoff cycle followed by a full uninterrupted charge — this rebuilds the coulomb counter reference and aligns the percentage readout to the new cell's actual curve.

Phone warm near the battery compartment on first charge cycle

A new high-impedance cell generates more heat during the initial charge cycle than a broken-in cell does. The SGH-A707 charge IC does not throttle current on first insertion — it applies the same charge rate regardless of cell condition. Warmth near the battery door in this first cycle is normal and typically resolves by the second charge. If the phone stays warm beyond the first full cycle, check that charge terminates at 4.2V and is not continuing past that point.